A Portable Magnetic Particle Spectrometer for Future Rapid and Wash-Free Bioassays.

Nowadays, there is an increasing demand for more accessible routine diagnostics for patients with respect to high accuracy, ease of use, and low cost. However, the quantitative and high accuracy bioassays in large hospitals and laboratories usually require trained technicians and equipment that is both bulky and expensive. In addition, the multistep bioassays and long turnaround time could severely affect the disease surveillance and control especially in pandemics such as influenza and COVID-19. In view of this, a portable, quantitative bioassay device will be valuable in regions with scarce medical resources and help relieve burden on local healthcare systems. Herein, we introduce the MagiCoil diagnostic device, an inexpensive, portable, quantitative, and rapid bioassay platform based on the magnetic particle spectrometer (MPS) technique. MPS detects the dynamic magnetic responses of magnetic nanoparticles (MNPs) and uses the harmonics from oscillating MNPs as metrics for sensitive and quantitative bioassays. This device does not require trained technicians to operate and employs a fully automatic, one-step, and wash-free assay with a user friendly smartphone interface. Using a streptavidin-biotin binding system as a model, we show that the detection limit of the current portable device for streptavidin is 64 nM (equal to 5.12 pmole). In addition, this MPS technique is very versatile and allows for the detection of different diseases just by changing the surface modifications on MNPs. Although MPS-based bioassays show high sensitivities as reported in many literatures, at the current stage, this portable device faces insufficient sensitivity and needs further improvements. It is foreseen that this kind of portable device can transform the multistep, laboratory-based bioassays to one-step field testing in nonclinical settings such as schools, homes, offices, etc.

Management of diabetes during fasting and COVID-19 - Challenges and solutions.

INTRODUCTION: Fasting is observed as a religious custom in various forms across the globe. Among them, the Ramadan fasting is very common and widely practiced. People with diabetes observe fasting with or without obtaining medical advice. Uncontrolled diabetes appears to be a risk factor for COVID-19 infection and its poorer outcomes. Fasting during Ramadan is challenging in people with diabetes. This year, the background of COVID-19 made it difficult for both the patients and health care workers to effectively manage diabetes and its complications during Ramadan. Because of a lack of sufficient evidence, clinicians were perplexed in handling this difficult situation. MATERIALS AND METHODS: We accessed PubMed, Google Scholar, various guidelines and other evidence-based articles to review the available current literature which deals with diabetes, Ramadan, and COVID-19. RESULTS: The importance of pre-Ramadan assessment, adequate nutrition, and hydration, choosing the right therapy has been emphasized. This review tries to address the common practical challenges and relevant possible solutions for the same. Due consideration has been given to various socio-cultural practices that can influence the management of diabetes patients in the setting of Ramadan and COVID-19 pandemic. CONCLUSIONS: Diabetes is associated with increased severity and susceptibility to COVID-19. People with diabetes should go through systemic and structure-based management during fasting. Family physicians who deliver personalized care play a vital role in managing diabetes during this crisis period. Telemedicine is emerging as an effective mode of managing various needs of individuals.